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US 12,474,235 B2Granted
Method and device for sampling pressure barrier of flexible pipes
AssigneePetroleo Brasileiro S.A. - Petrobras
InventorHenri Fiorenza De Lima
Life of this patent
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Abstract
The present invention proposes a split clamp (7), typical of trepanning operations in pipes, which allows the intervention with a tool (3) that makes a circular hole in the pipe (1) under analysis, removing layer by layer, until reaching the pressure barrier (2). With this, a sample of the layer of interest is removed to be forwarded for analysis. Such a clamp (7) has means to isolate the pipe (1) from the external environment, introduce the tool (3) and remove the same with the sample, also allowing tightness repair of the pipe (1).
Claims17
A method for sampling pressure barrier of flexible pipes comprising:
- a) shutting down production, depressurizing, and cleaning a pipe to be evaluated;
- b) coupling a split clamp on an external side of the pipe;
- c) intervening with a circular hole tool through a socket of the split clamp;
- d) removing layer by layer of the pipe until reaching a pressure barrier;
- e) removing the circular hole tool and introducing a knife;
- f) collecting a sample from the pressure barrier using a collection tool;
- g) removing the split clamp;
- h) introducing a repair device and expand the repair device inside a hole made in the pipe;
- i) bending an upper edge of the repair device;
- j) injecting sealing polymer through a first injection channel present in the repair device;
- k) inserting a sealing disk and a sealing plug;
- l) Injecting sealing polymer through a second injection channel present in the sealing plug;
- m) installing a final clamp.
10 more elements
Dependencies are inferred from the claim text.